<template>
  <div class="cc-decoration-1 col" :ref="ref">
    <svg
      :width="`${svgWH[0]}px`"
      :height="`${svgWH[1]}px`"
      :style="`transform:scale(${svgScale[0]},${svgScale[1]});`"
    >
      <template v-for="(point, i) in points">
        <rect
          v-if="Math.random() > 0.6"
          :key="i"
          :fill="mergedColor[0]"
          :x="point[0] - halfPointSideLength"
          :y="point[1] - halfPointSideLength"
          :width="pointSideLength"
          :height="pointSideLength"
        >
          <animate
            v-if="Math.random() > 0.6"
            attributeName="fill"
            :values="`${mergedColor[0]};transparent`"
            dur="1s"
            :begin="Math.random() * 2"
            repeatCount="indefinite"
          />
        </rect>
      </template>

      <rect
        v-if="rects[0]"
        :fill="mergedColor[1]"
        :x="rects[0][0] - pointSideLength"
        :y="rects[0][1] - pointSideLength"
        :width="pointSideLength * 2"
        :height="pointSideLength * 2"
      >
        <animate
          attributeName="width"
          :values="`0;${pointSideLength * 2}`"
          dur="2s"
          repeatCount="indefinite"
        />
        <animate
          attributeName="height"
          :values="`0;${pointSideLength * 2}`"
          dur="2s"
          repeatCount="indefinite"
        />
        <animate
          attributeName="x"
          :values="`${rects[0][0]};${rects[0][0] - pointSideLength}`"
          dur="2s"
          repeatCount="indefinite"
        />
        <animate
          attributeName="y"
          :values="`${rects[0][1]};${rects[0][1] - pointSideLength}`"
          dur="2s"
          repeatCount="indefinite"
        />
      </rect>

      <rect
        v-if="rects[1]"
        :fill="mergedColor[1]"
        :x="rects[1][0] - 40"
        :y="rects[1][1] - pointSideLength"
        :width="40"
        :height="pointSideLength * 2"
      >
        <animate attributeName="width" values="0;40;0" dur="2s" repeatCount="indefinite" />
        <animate
          attributeName="x"
          :values="`${rects[1][0]};${rects[1][0] - 40};${rects[1][0]}`"
          dur="2s"
          repeatCount="indefinite"
        />
      </rect>
    </svg>
  </div>
</template>

<script>
import { DecorationMixin } from 'boot/mixins/decoration';

export default {
  mixins: [DecorationMixin],
  name: 'CcDecoration1',
  props: {
    color: {
      type: Array,
      default: () => ([]),
    },
  },
  data() {
    const pointSideLength = 2.5;
    return {
      ref: 'decoration-1',
      svgWH: [200, 50],
      svgScale: [1, 1],
      rowNum: 4,
      rowPoints: 20,
      pointSideLength,
      halfPointSideLength: pointSideLength / 2,
      points: [],
      rects: [],
      defaultColor: ['#fff', '#0de7c2'],
      mergedColor: [],
    };
  },
  methods: {
    afterAutoResizeMixinInit() {
      const { calcSVGData } = this;
      calcSVGData();
    },
    calcSVGData() {
      const { calcPointsPosition, calcRectsPosition, calcScale } = this;
      calcPointsPosition();
      calcRectsPosition();
      calcScale();
    },
    calcPointsPosition() {
      const { svgWH, rowNum, rowPoints } = this;
      const [w, h] = svgWH;
      const horizontalGap = w / (rowPoints + 1);
      const verticalGap = h / (rowNum + 1);
      const points = new Array(rowNum).fill(0).map((foo, i) => new Array(rowPoints).fill(0)
        .map((f, j) => [
          horizontalGap * (j + 1), verticalGap * (i + 1),
        ]));

      this.points = points.reduce((all, item) => [...all, ...item], []);
    },
    calcRectsPosition() {
      const { points, rowPoints } = this;

      const rect1 = points[rowPoints * 2 - 1];
      const rect2 = points[rowPoints * 2 - 3];

      this.rects = [rect1, rect2];
    },
    calcScale() {
      const { width, height, svgWH } = this;
      const [w, h] = svgWH;
      this.svgScale = [width / w, height / h];
    },
    onResize() {
      const { calcSVGData } = this;
      calcSVGData();
    },
  },
};
</script>

<style lang="stylus">
.cc-decoration-1
  svg
    transform-origin left top
</style>
